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ADS901E Datasheet(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
No. de pieza ADS901E
Descripción Electrónicos  10-Bit, 20MHz, 3V Supply ANALOG-TO-DIGITAL CONVERTER
Download  11 Pages
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Fabricante Electrónico  BURR-BROWN [Burr-Brown (TI)]
Página de inicio  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS901E Datasheet(HTML) 9 Page - Burr-Brown (TI)

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9
®
ADS901
R
1
1k
OPA680
V
IN
R
F
402
V
CM
C
1
0.1µF
0.1µF
IN
CM
+5V
R
S
50
+3V
R
G
402
C
G
0.1µF
402
22pF
ADS901
FIGURE 4. DC-Coupled Interface Circuit for +3V Single-Supply Operation.
dual supplies (OPA650, OPA658). The mid-point reference
voltage, VCM, biases the bipolar, ground-referenced input
signal. The capacitor C1 and resistor R1 form a high-pass
filter with the –3dB frequency set at
f–3dB = 1/(2 π R1 C1)
(2)
The values for C1 and R1 are not critical in most applications
and can be set freely. The values shown correspond to a
frequency of 1.6kHz.
Figure 3 depicts a circuit that can be used in single-supply
applications. The mid-reference voltage biases the op amp
up to the appropriate common-mode voltage, for example
VCM = +1.5V. With the use of capacitor CG the DC gain for
the non-inverting op amp input is set to +1V/V. As a result
the transfer function is modified to
VOUT = VIN {(1 + RF/RG) + VCM}
(3)
Again, the input coupling capacitor C1 and resistor R1 form
a high-pass filter. At the same time the input impedance is
defined by R1. Resistor RS isolates the op amp’s output from
the capacitive load to avoid gain peaking or even oscillation.
It can also be used to establish a defined bandwidth to reduce
the wideband noise. The recommended value is usually
between 10
Ω and 100Ω.
DC-COUPLED INTERFACE CIRCUIT
Many systems are now requiring +3V single supply capabil-
ity of both the A/D converter and its driver. Figure 4 shows
an example for DC-coupled configuration operating solely
on a +3V supply voltage. The OPA632 provides excellent
performance in this demanding application. Its wide input
and output voltage ranges, an low distortion, supports the
ADS901 well. The OPA632 is configured for a gain of +2.
The 374
Ω and 2.26kΩ resistors at the input level-shift V
IN
so that VOUT is within the allowed output voltage range
when VIN = 0. The input impedance of the driver circuit is
set to match to a 50
Ω source impedance. The input level-
shifting was designed that VIN can be between 0V and 5V,
while delivering an output voltage of 1V to 2V into the
ADS901. Both the OPA632 and ADS901 have a power-
down function pin with the same polarity for those systems
the need to conserve power.
EXTERNAL REFERENCE
The ADS901 requires external references on pin 22 (REFT)
and 24 (REFB). Internally those pins are connected through a
resistor ladder, which has a nominal resistance of 4k
(
±15%). In order to establish a correct voltage drop across the
ladder the external reference circuit must be able to typically
supply 250
µA of current. With this current the full-scale input
range of the ADS901 is set between +1V and +2V, or 1Vp-p.
In general, the voltage drop across REFT and REFB deter-
mines the input full-scale range (FSR) of the ADS901. Equa-
tion (4) can be used to calculate the span.
FSR = REFT - REFB
(4)
Depending on the application, several options are possible to
supply the external reference voltages to the ADS901 without
degrading the typical performance.
FIGURE 3. Interface Circuit. Example using the voltage feedback amplifier OPA680.
OPA632
V
IN
750
562
2.26k
374
22pF
+3V
100
Pwrdn
DIS
Disable
+3V
ADS901
10-Bit
20Msps
57.6


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